Endress+Hauser CM442R, CM444R, CM448R Technical Information

Extensible multiparameter controller for monitoring and controlling
processes in industry and the environmental sector

Application

Possible to connect up to 8 Memosens sensors
Mathematic functions calculate new measured values
Digital fieldbuses (HART, PROFIBUS, Modbus, Ethernet/IP)
and integrated web server
A cleaning function, controller and alarm relay can be selected
Optional digital or analog inputs/outputs for signal
transmission

The primary applications are:

• Food and beverages

• Life science

• Water and wastewater

• Chemical industry

Your benefits

• Maximum process safety thanks to:
– Simple menu guidance via optional graphic display
– Standardized operating concept across all devices from the

Liquiline, sampler and analyzer platform

• Fast commissioning thanks to:
– Memosens: lab-calibrated sensors & hot plug-and-play
– Preconfigured Liquiline transmitter
– Easy extension and adaptation

• Minimum inventory:
– Cross-platform, modular concept (e.g. identical modules

irrespective of parameters)

– Integration into Fieldcare and W@M facilitates effective

asset management

Products Solutions Services

Technical Information

Liquiline CM442R/CM444R/
CM448R

Cabinet controller with a maximum of eight measuring
channels based on digital Memosens technology

TI01112C/07/EN/04.15
71288160

Liquiline CM442R/CM444R/CM448R

2 Endress+Hauser

Table of contents

Function and system design ................... 4

Measuring system ............................. 4

Application example ........................... 5

Device architecture .......................... 6

Slot and port assignment ........................ 6

Order of the modules ........................... 6

Basic rule for hardware upgrades ................... 6

Determining the hardware delivery status ............. 7

Terminal diagram ............................. 7

Device configuration using the example of a

CM442R- **M1A1F0* .......................... 8

Function diagram CM442R ....................... 9

Device configuration using the example of a

CM444R- **M42A1FA* ....................... 10

Function diagram CM444R ...................... 11

Device configuration using the example of a

CM448R-**26A1* ........................... 12

Function diagram CM448R ...................... 13

Communication and data processing ........... 14

Dependability ............................. 14

Reliability ................................. 14

Maintainability .............................. 15

Safety .................................... 18

Input .................................... 19

Measured variables ........................... 19

Measuring ranges ............................ 19

Types of input ............................... 19

Input signal ................................ 19

Cable specification ............................ 19

Digital inputs, passive ....................... 19

Electrical specification ......................... 19

Span ..................................... 19

Nominal input current ......................... 19

PFM function ............................... 19

Test voltage ................................ 19

Cable specification ............................ 19

Current input, passive ....................... 19

Span ..................................... 19

Signal characteristic ........................... 19

Internal resistance ............................ 19

Test voltage ................................ 19

Output .................................. 20

Output signal ............................... 20

Signal on alarm .............................. 21

Load ..................................... 21

Linearization/transmission behavior ................ 21

Digital outputs, passive ..................... 21

Electrical specification ......................... 21

PFM function ............................... 21

Auxiliary voltage ............................. 21

Test voltage ................................ 21

Cable specification ............................ 21

Current outputs, active ...................... 21

Span ..................................... 21

Signal characteristic ........................... 21

Electrical specification ......................... 21

Cable specification ............................ 21

Relay outputs ............................. 22

Electrical specification ......................... 22

Cable specification ............................ 22

Protocol-specific data ....................... 22

HART .................................... 22

PROFIBUS DP ............................... 23

Modbus RS485 .............................. 23

Modbus TCP ................................ 23

EtherNet/IP ................................ 23

Web server ................................. 24

Power supply ............................. 24

Supply voltage .............................. 24

Fieldbus connection ........................... 24

Power consumption ........................... 24

Fuse ..................................... 25

Overvoltage protection ......................... 25

Cable specification for optional display cable .......... 25

Electrical connection .......................... 25

Connecting optional modules ..................... 28

Protective ground connection .................... 29

Sensor connection ............................ 30

Performance characteristics .................. 32

Response time .............................. 32

Reference temperature ......................... 32

Measured error for sensor inputs .................. 32

Measured error for current inputs and outputs ......... 32

Frequency tolerance of digital inputs and outputs ....... 32

Resolution of current inputs and outputs ............. 32

Repeatability ............................... 32

Mounting ................................ 33

Mounting on DIN rail as per IEC 60715 .............. 33

Wall mounting .............................. 33

Mounting the external display .................... 34

Environment .............................. 34

Ambient temperature range ..................... 34

Storage temperature .......................... 35

Humidity .................................. 35

Degree of protection .......................... 35

Climate class ............................... 35

Vibration resistance ........................... 35

Electromagnetic compatibility .................... 35

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 3

Electrical safety .............................. 36

Degree of contamination ....................... 36

Mechanical construction .................... 36

Dimensions ................................ 36

Weight ................................... 39

Materials .................................. 39

Operability ............................... 40

External display ............................. 40

Operating concept ............................ 40

Local operation via external, optional display .......... 40

Remote operation ............................ 41

Language packages ........................... 42

Certificates and approvals ................... 43

 mark ................................... 43

cCSAus ................................... 43

cETLus NI Cl. I, Div. 2 .......................... 43

Ordering information ....................... 43

Product page ............................... 43

Product Configurator .......................... 43

Scope of delivery ............................. 43

Accessories ............................... 44

Measuring cable ............................. 44

Sensors ................................... 44

Additional functionality ........................ 48

Software .................................. 49

Other accessories ............................. 50

Liquiline CM442R/CM444R/CM448R

4 Endress+Hauser

Function and system design

Measuring system

The overview shows examples of measuring systems. Other sensors and assemblies can be ordered
for conditions specific to your application (www.endress.com/products).

Measuring point pH value or ORP

A complete measuring system comprises:

• Liquiline transmitter

• Optional display

• Sensors with Memosens technology

• Assemblies to suit the sensors used

 1 Cabinet installation (without sensor and signal

cables)

1 Optional display (back)
2 Liquiline
3 External power unit (CM444R and CM448R only)
4 Power supply cable (to be provided by the

customer)

5 Display cable

pH measurement in drinking
water (→ Fig.)

• Retractable assembly Cleanfit
CPA871

• Sensor Orbisint CPS11D

• Measuring cable CYK10

ORP in drinking water

• Immersion assembly Dipfit
CYA112

• Sensor Orbisint CPS12D

• Measuring cable CYK10

Conductivity

Inductive conductivity
measurement in wastewater
treatment

• Sensor Indumax CLS50D

• Sensor fixed cable

Conductive conductivity
measurement in power plant
cooling water

• Sensor Condumax CLS15D

• Measuring cable CYK10

Oxygen

Oxygen in aeration basins

• Immersion assembly Dipfit
CYA112

• Holder CYH112

• Sensor
– COS61D (optical) with fixed

cable (→ Fig.)

– COS51D (amperometric),

cable CYK10

Nitrate and SAC Turbidity and interface

Nitrate in wastewater

• Sensor CAS51D-**A2 with
fixed cable

• Immersion assembly CYA112

• Holder CYH112

SAC in the wastewater treatment
outlet

• Sensor CAS51D-**2C2 with
fixed cable

• Immersion assembly CYA112

• Holder CYH112

Turbidity in industrial water

• Sensor Turbimax CUS51D with
fixed cable (→ Fig.)

• Assembly Flowfit CUA250

• Spray head CUR3 (optional)

Interface in the primary clarifier

• Sensor Turbimax CUS71D

• Assembly CYA112

• Holder CYH112

Chlorine Ion-selective electrodes

Chlorine (and pH) in drinking
water

• Sensor CCS142D

• Sensor CPS11D

• Measuring cable CYK10

• Flow assembly CCA250

Ammonium and nitrate
measurement in the aeration basin

• Sensor CAS40D with fixed cable

• Holder CYH112

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 5

Application example

• Transmitter CM444R-AAM44A0FM6 with:
4 x Memosens, Modbus TCP, 2 digital inputs and 2 digital outputs, 2 x relays for cleaning/limit
value, 2 x analog current input

• pH and temperature with CPS11D, item 1 (www.endress.com/cps11d)

• Chlorine with CCS142D, item 4 (www.endress.com/ccs142d)

• 2 x conductivity, inductive measurement with CLS50D, item 2 and 3 (www.endress.com/cls50d)

• 1 x measuring range switching for conductivity via Modbus module

• Flow assembly CCA250 with optional proximity switch INS (www.endress.com/cca250)

• Chlorine regulation with dosing interrupted if no flow: proximity switch via digital input of DIO
module, flow feedforward control (via digital or analog input), PFM-controlled dosing pump via
digital output of DIO module

Outlet 1

MENU

CH 1:1 pH

CH 1:1 Temperature

CH 1:2

CH 2:1 Cond I

CH 2:2 Chlorine

CH 3:1 Current Input [Flow]

Cond I

6.99 pH

25.1 °C

9.02 mS/cm

13.41 mS/cm

9.03 mg/l

15.1 nA

11:12:13 29.06.2013

10.00

mS/cm

8.00

mS/cm

29.05.2013
10:02:20

29.06.2013
11:09:15

6.00
pH

29.05.2013
10:02:20

29.06.2013
11:09:15

12.00
pH

Field Data Manager

2

1

4

3

A0025347

 2 Measuring point in the CIP process

Data retention

• Storage of all measured values, incl. values of external sources, in the non-volatile memory
(data logbook)

• Data called up on site via user-defined measuring menu and load curve display of the data logbook

• Transmission of data by ethernet, CDI interface or SD card and storage in a tamper-proof database
(Field Data Manager)

• Data export to csv file (for Microsoft Excel)

Liquiline CM442R/CM444R/CM448R

6 Endress+Hauser

Device architecture

Slot and port assignment

Slots

1

2

1

2

1

2

1

2

Ports

BASE-E

2DS 2DS 2DS 2AI 2AO 4R

1

2

Sensor 1

Sensor 1

Sensor 1

Sensor 2

Sensor 2

Sensor 2

1

2

1

2

1

2

1

2

3

4

 3 Slot and port assignment of the hardware modules

 4 Slot and port assignment on the

display

• Inputs are assigned to measuring channels in the
ascending order of the slots and ports.
Adjacent example:
"CH1: 1:1 pH glass" means:
Channel 1 (CH1) is slot 1 (basic module) : Port 1 (input

1), pH glass sensor

• Outputs and relays are named according to their
function, e.g. "current output", and are displayed with the
slot and port numbers in ascending order

Order of the modules

Depending on the version ordered, the device is supplied with a number of electronic modules, which
are assigned in a specific sequence in ascending order to slots 0 to 7. If you do not have a particular
module, the next moves up automatically:

• The basic module (which is always present) always occupies slots 0 and 1

• Fieldbus module 485 or Ethernet module ETH (only one of the two modules can be used)

• Memosens input module 2DS (DS = digital sensor)

• Extension module for digital inputs and outputs DIO (DIO = digital input and output)

• Current input module 2AI (AI = analog input)

• Current output module 4AO or 2AO (AO = analog output)

• Relay modules AOR, 4R or 2R (AOR = analog output + relay, R = relay)
Modules with 4 ports are connected before modules of the same type with 2 ports.

Basic rule for hardware
upgrades

Please note the following if upgrading the device:

• The sum of all current inputs and outputs may not exceed 8!

• A maximum of two "DIO" modules may be used.

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 7

Determining the hardware
delivery status

You must be aware of the type of modules and the number of them supplied with the device you
have ordered to determine the delivery status of your Liquiline.

• Basic module
One basic module in all versions. Always occupies slots 0 and 1.

• Fieldbus module
Optional, and only one fieldbus module is possible.

• Input modules
– Must be clearly assigned to the number of optional inputs ordered.
– Examples:

2 current inputs = module 2AI
4 Memosens inputs = 2 inputs with basic module + module 2DS with 2 further inputs

• Current outputs and relays
Various module combinations can exist.
The following table will help you determine which modules your device has, depending on the type
and number of outputs.

Current outputs

Relays

0 2 4

2 - 1 x 2R 1 x 4R

4 1 x 2AO 1 x AOR 1 x 2AO + 1 x 4R

6 1 x 4AO 1 x 4AO + 1 x 2R 1 x 4AO + 1 x 4R

8 1 x 4AO + 1 x 2AO 1 x 4AO + 1 x 2AO + 1 x 2R 1 x 4AO + 1x 2AO + 1 x 4R

‣

Sum up the number of modules and sort them according to the specified sequence →  6.
 This will give you the slot assignment for your device.

Terminal diagram

The unique terminal name is derived from:

Slot no. : Port no. : Terminal

Example, NO contact of a relay

Device with 4 inputs for digital sensors, 4 current outputs and 4 relays

• Basic module BASE-E (contains 2 sensor inputs, 2 current outputs)

• Module 2DS (2 sensor inputs)

• Module 2AO (2 current outputs)

• Module 4R (4 relays)

1 2

3

4

43

42 41

43

42 41

43

42 41

43

42 41

Relay 1

Relay 2

Relay 3

Relay 4

Slot

Slot 4

Port 1

Pin 41

A0025105

 5 Creating a terminal diagram using the example of the NO contact (terminal 41) of a relay

Liquiline CM442R/CM444R/CM448R

8 Endress+Hauser

Device configuration using
the example of a CM442R­**M1A1F0*

A0025348

Ordered basic device (example) • Order code CM442R-**M1A1F0*

• Functionality: 1 x Memosens, 2 current outputs without HART

Extension options without additional
modules

• Second Memosens input (71114663)

• HART with activation code (71128428)

Extension options by using an
extension module in free slot 2

• Ethernet/PROFIBUS DP/Modbus with module 485 incl. activation
code for the desired communication protocol:
– PROFIBUS DP (71140888)
– Modbus RS485 (71140889)
– Modbus TCP (71140890)
– EtherNet/IP (71219868)
– Only Ethernet without fieldbus (71135634)

If fieldbus communication is subsequently required, an activation
code is needed for this.

• Alternative for Ethernet or Modbus TCP: module ETH



If you retrofit module 485, any existing current outputs are
disabled! Alternative: ETH (Ethernet, Modbus TCP only).

Additional inputs or outputs, relays:
– Module 2AI (71135639): 2 current inputs
– Module 2AO (71135632): 2 current outputs
– Module AOR (71111053): 2 current outputs, 2 relays
– Module 2R (71125375) or 4R (71125376): 2 or 4 relays
– Module DIO (71135638): 2 digital inputs and 2 digital outputs

Basic rule for extensions The sum of all current inputs and outputs may not exceed 8!

Restrictions if using CUS71D sensors
for interface measurement

Only one CUS71D can be connected. The second Memosens input
may not be used.

Product Configurator www.endress.com/cm442r

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 9

Function diagram CM442R

mA

31

32

85

86

87

88

97

98

87

88

97

98

optional

L+L-L

N

~ =

HART

mA

31

32

optional

41

42

43

mA

31

32

mA

31

32

23

24

23

24

optional

optional

optional

optional

optional

1

2

3

3

4

2

2

5

5

6

8

8

9

10

10

10

10

7

41

42

43

41

42

43

41

42

43

41

42

43

PE

85

86

mA

mA

optional

47

48

+

–

+

–

47

48

45

46

+

–

11

45

46

+

–

91

92

91

92

A0015791

 6 Block circuit diagram CM442R
1

2
3
4
5

Current output 1:1, + HART (optional)
Current outputs (2 x optional)
2 x Memosens input (1 x optional)
PROFIBUS DP/Modbus/Ethernet (optional)
2 x current input (optional)

6
7
8
9
10
11

Power connection
Service interface
Power supply, fixed cable sensors
Alarm relay
2 or 4 x relays (optional)
2 digital inputs and outputs (optional)

Liquiline CM442R/CM444R/CM448R

10 Endress+Hauser

Device configuration using
the example of a CM444R­**M42A1FA*

Ordered basic device (example) • Order code CM444R-**M42A1FA*

• Functionality:
– 4 x Memosens (2 on BASE-E module + 2 on an extension

module 2DS)
– PROFIBUS communication (module 485)
– 2 current outputs without HART (on BASE-E module)
– 2 current inputs (module 2AI)

3 slots are still free in this example. More or fewer slots can be free in
other versions.

Extension options without additional
modules

None

Modification options without
additional modules

• Communication type changed by entering activation code. This
disables the communication type used previously!
– Modbus RS485 (71140889)
– Modbus TCP (71140890)
– EtherNet/IP (71219868)

• Retrofit to HART by removing module 485 and entering activation
code for HART (71128428)

Extension options by using extension
modules in free slots 5-7

Only the following is possible for the example above:
Module 2R (71125375) or 4R (71125376): 2 or 4 relays

If extending to eight measuring channels:

• Module 2DS (71135631): 2 Memosens inputs

• Use of the 2 current outputs in the basic module by entering
activation code (71140891)

Additional inputs or outputs and relays if fieldbus module 485 is
removed:

• Module 2AO (71135632): 2 current outputs

• Module AOR (71111053): 2 current outputs, 2 relays

• Module 2R (71125375) or 4R (71125376): 2 or 4 relays

• Module DIO (71135638): 2 digital inputs and 2 digital outputs



If you replace module 485 with ETH, you can operate up to 6
current outputs in addition to the ETH module's ethernet or
Modbus function. Only two current outputs are possible with

485.

Basic rule for extensions The sum of all current inputs and outputs may not exceed 8!

Restrictions if using CUS71D sensors
for interface measurement

• With the CM444R, any combination of maximum 4 Memosens
sensors is possible.

• An extension to CM448R is not advisable as the maximum number
of Memosens inputs remains limited to 4 if a CUS71D is used.

Product Configurator www.endress.com/cm444r

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 11

Function diagram CM444R

mA

31

87
88
97
98

87
88
97
98

optional

optional

mA

mA

23

optional

optional

optional

optional

optional

1

2

3

3

4

2

2

5

5

6

8

8

9

10

10

10

10

7

32

31

32

31

32

24

23

24

87
88
97
98

3 8

87
88
97
98

3 8

mA

mA

optional

2

2

31

32

31

32

mA

mA

optional

2

2

31

32

31

32

HART

mA

31

32

optional

85

86

85

86

85

86

85

86

mA

mA

41

42

43

41

42

43

41

42

43

41

42

43

41

42

43

45

46

47

48

+
–

+
–

45

46

11

+

–

47

48

+

–

+
–

+
–

optional

L+L-L

N

~ =

PE

91

92

91

92

A0015827

 7 Block circuit diagram CM444R
1

2
3
4
5

Current output 1:1, + HART (both optional)
Max. 7 x current output (optional)
Memosens input (2 x standard + 2 x optional)
PROFIBUS DP/Modbus/Ethernet (optional)
2 x current input (optional)

6
7
8
9
10
11

Power connection
Service interface
Power supply, fixed cable sensors
Alarm relay
2 or 4 x relays (optional)
2 digital inputs and outputs (optional)

Liquiline CM442R/CM444R/CM448R

12 Endress+Hauser

Device configuration using
the example of a CM448R­**26A1*

Ordered basic device (example) • Order code CM448R-**26A1*

• Functionality:
– 6 x Memosens (2 on BASE-E module + 2 on two extension

modules 2DS)

– PROFIBUS communication (module 485)

3 slots are still free in this example. More or fewer slots can be free in
other versions.

Extension options without additional
modules

None

Modification options without
additional modules

• Communication type changed by entering activation code. This
disables the communication type used previously!
– Modbus RS485 (71140889)
– Modbus TCP (71140890)
– EtherNet/IP (71219868)

• Retrofit to HART by removing module 485 and entering activation
code for HART (71128428)

Extension options by using extension
modules in free slots 5-7

Only the following is possible for the example above:
Module 2R (71125375) or 4R (71125376): 2 or 4 relays

If extending to eight measuring channels:

• Module 2DS (71135631): 2 Memosens inputs

• Use of the 2 current outputs in the basic module by entering
activation code (71140891)

Additional inputs or outputs, relays:

• Module 2AO (71135632): 2 current outputs

• Module AOR (71111053): 2 current outputs, 2 relays

• Module 2R (71125375) or 4R (71125376): 2 or 4 relays

• Module DIO (71135638): 2 digital inputs and 2 digital outputs



If you replace module 485 with ETH, you can operate up to 6
current outputs in addition to the ETH module's ethernet or
Modbus function. Only two current outputs are possible with

485.

Basic rule for extensions The sum of all current inputs and outputs may not exceed 8!

Restrictions if using CUS71D sensors
for interface measurement

The maximum number of Memosens inputs that can be used is
limited to 4! Here, every combination of CUS71D and other
Memosens sensors is then possible.

Product Configurator www.endress.com/cm448r

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 13

Function diagram CM448R

87
88
97
98

87
88
97
98

optional

mA

mA

optional

optional

optional

optional

1

2

3

3

4

2

2

6

8

9

10

10

10

10

7

31

32

31

32

87
88
97
98

3

87
88
97
98

3 8

mA

mA

optional

2

2

31

32

31

32

mA

mA

optional

2

2

31

32

31

32

87
88
97
98

3

8

87
88
97
98

3

8

87
88
97
98

3

87
88
97
98

3

mA

31

optional

32

HART

mA

31

32

optional

85

86

85

86

85

86

85

86

8

8

8

8

85

86

85

86

85

86

85

86

41

42

43

41

42

43

41

42

43

41

42

43

41

42

43

47

48

11

+

–

47

48

+

–

optional

L+L-L

N

~ =

PE

45

46

+
–

+
–

45

46

+
–

+
–

91

92

91

92

A0015828

 8 Block circuit diagram CM448R
1

2
3
4
6

Current output 1:1, + HART (both optional)
Max. 7 x current output (optional)
Max. 8 x Memosens input (of which 2 x optional)
PROFIBUS DP/Modbus/Ethernet (optional)
Power connection

7
8
9
10
11

Service interface
Power supply, fixed cable sensors
Alarm relay
2 or 4 x relays (optional)
2 digital inputs and outputs (optional)

Liquiline CM442R/CM444R/CM448R

14 Endress+Hauser

Communication and data processing

Types of communication:

• Fieldbuses
– HART
– PROFIBUS DP (Profile 3.02)
– Modbus TCP or RS485

• Configuration via Ethernet

• EtherNet/IP

Only one type of Fieldbus communication can ever be active. The last activation code entered
decides which bus is used.

The device drivers available make it possible to perform a basic setup and display measured
values and diagnostics information via the fieldbus. A full device configuration via the fieldbus
is not possible.

Extension module 485 and current outputs

For communication types PROFIBUS DP, Modbus and Ethernet:

• CM442R
Current outputs cannot be used in parallel. Any existing current outputs are deactivated with the
installation of 485.

• CM444R/CM448R
Max. of 2 current outputs can be used in parallel.

Extension module ETH and current outputs

• Communication via Ethernet or EtherNet/IP

• CM442R
Max. of 2 current outputs can be used in parallel.

• CM444R and CM448R
Max. of 6 current outputs can be used in parallel.

Bus termination on the device

• Via slide switch at bus module 485

• Displayed via LED "T" on bus module 485

Dependability

Reliability

Memosens

MEMO SENS

Memosens makes your measuring point safer and more reliable:

• Non-contact, digital signal transmission enables optimum galvanic isolation

• No contact corrosion

• Completely watertight

• Laboratory sensor calibration possible, thus increasing measured value availability

• Intrinsically safe electronics mean operation in hazardous areas is not a problem.

• Predictive maintenance thanks to recording of sensor data, e.g.:
– Total hours of operation
– Hours of operation with very high or very low measured values
– Hours of operation at high temperatures
– Number of steam sterilizations
– Sensor condition

Sensor Check System (SCS)

The Sensor Check System (SCS) monitors the high impedance of the pH glass. An alarm is issued if a
minimum impedance value is undershot or a maximum impedance is exceeded.

• Glass breakage is the main reason for a drop in high impedance values

• The reasons for increasing impedance values include:
– Dry sensor
– Worn pH glass membrane

For the SCS, upper and lower limit values can be enabled or disabled independently of one
another.

Liquiline CM442R/CM444R/CM448R

Endress+Hauser 15

Process Check System (PCS)

The process check system (PCS) checks the measuring signal for stagnation. An alarm is triggered if
the measuring signal does not change over a specific period (several measured values).

The main causes of stagnating measured values are:

• Contaminated sensor, or sensor outside of medium

• Sensor defective

• Process error (e.g. through control system)

Sensor Condition Check (SCC)

This function monitors the condition of the electrode and the degree of electrode aging. The status is
indicated by the messages "SCC bad" or "SCC sufficient". The condition of the electrode is updated after
every calibration.

Self-monitoring functions

Current inputs are deactivated in the event of overcurrent and reactivated once the overcurrent
stops. Board voltages are monitored and the board temperature is also measured.

USP and EP

The limit functions for pharmaceutical water in accordance with USP and EP specifications are
implemented in the software for conductivity measurements:

• "Water for Injection" (WFI) as per USP <645> and EP

• "Highly Purified Water" (HPW) as per EP

• "Purified Water" (PW) as per EP
The uncompensated conductivity value and the temperature are measured for the USP/EP limit

functions. The measured values are compared against the tables defined in the standards. An alarm
is triggered if the limit value is exceeded. Furthermore, it is also possible to configure an early
warning alarm that signals undesired operating states before they occur.

ChemocleanPlus

Freely programmable sequence control

• e.g. for automatic sensor cleaning in retractable assemblies for reliable measurement results in
processes with a high risk of contamination

• Individual, time-based activation of 4 outputs e.g. relays

• Starting, stopping or pausing of activities via digital input or fieldbus signals e.g. from limit
position switches

Maintainability Modular design

The modular transmitter design means it can be easily adapted to suit your needs:

• Retrofit extension modules for new or extended range of functions, e.g. current outputs, relays and
digital communication

• Upgrade to maximum of eight-channel measurement

• Optional: M12 sensor connector for connecting any kind of Memosens sensor

• Optional: CDI connector for external access to the service interface (avoids having to unscrew the
housing cover)

A0016027

 9 CM444R: example

A0012440

 10 Extension module

Liquiline CM442R/CM444R/CM448R

16 Endress+Hauser

Data logger function

• Adjustable scan time: 1 to 3600 s (1 h)

• Data logbooks:
– Max. 8 data logbooks
– 150,000 entries per logbook
– Graphic display (load curves) or numerical list

• Calibration logbook: max. 75 entries

• Hardware version logbook:
– Hardware configuration and modifications
– Max. 125 entries

• Version logbook:
– E.g. software updates
– Max. 50 entries

• Operation logbook: max. 250 entries

• Diagnostics logbook: max. 250 entries

A0015032

 11 Data logbook: Graphic display

Logbooks remain unchanged even after a software update.

SD card

The exchangeable storage medium enables:

• Quick and easy software updates and upgrades

• Data storage of internal device memory (e.g. logbooks)

• Transfer of complete configurations to a device with an identical setup (backup function)

• Transfer of configurations without the TAG and bus address to devices with an identical setup
(copy function)

• Saving of screenshots for documentation purposes

Endress+Hauser offers industry-approved SD cards as accessories. These memory cards provide
maximum data security and integrity.

Other SD cards can also be used. However, Endress+Hauser does not accept any responsibility for the
data security of such cards.

External signals for device control and for activating external devices

Hardware options, e.g. module "DIO" with 2 digital inputs and 2 digital outputs or fieldbus module
"485" enable the following:

• via a digital input signal
– measuring range switching for conductivity (upgrade code required, see accessories)
– switching between different calibration datasets in the case of optical sensors
– an external hold
– a cleaning interval to be triggered
– switching on and off a PID controller, e.g. via the proximity switch of the CCA250
– the use of the input as an "analog input" for pulse-frequency modulation (PFM)

• via a digital output signal
– the static transmission (similar to a relay) of diagnostic states, point level switch states etc.
– the dynamic transmission (comparable to a non-wearing "analog output") of PFM signals, e.g. to

control dosing pumps.